You spelled "field" wrong, but I get where you're going with this card.
Anyway, I fixed the OCG for you
When this card is Synchro Summoned, you can return up to 3 Monster cards you control to your hand. This card gains 500 ATK for each card returned to the hand by this effect. When this card battles a monster your opponent controls, you can return 2 "Mist Valley" monsters you control to your hand to have the monster returned to its owners hand.
It's a good card, but I think you should lower the ATK gain a bit (if you return 3 monsters, this card can get up to 3800 ATK with the current one)
Anyway, 8.5/10